?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=G&rft.au=Laricchia%2C+G&rft.aulast=Laricchia&rft.volume=68&rft.title=European+Physical+Journal+D&rft.issn=1434-6060&rft.atitle=Ionization+cross-sections+for+positron+collisions+with+N2&rft.date=March+2014&rft.genre=article